Alternite timeline....or some sort of purgatory?

The characters that died on the island and that we saw in the alt timeline seemed to know more then they were letting on. Locke and Charlie especialy "i was supposed to die" and Locke seemed to know about Jack's fathers coffin. Could we be instead looking at a purgotory, and Desmonds sudden apperance and disapearance was Desmonds consciounness fading in and out while he was in surgery for Ben's bullet wound?

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